Log AVERROR messages from FFmpegDemuxer in chrome://media-internals.

media/filters/ffmpeg_video_decoder.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "media/filters/ffmpeg_video_decoder.h"
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include <algorithm>
@@ skipping 344 matching lines @@
   }
 
   int frame_decoded = 0;
   int result = avcodec_decode_video2(codec_context_.get(),
                                      av_frame_.get(),
                                      &frame_decoded,
                                      &packet);
   // Log the problem if we can't decode a video frame and exit early.
   if (result < 0) {
     MEDIA_LOG(DEBUG, media_log_)
-        << "avcodec_decode_video2(): " << AVErrorToString(result) << ", at "
+        << GetDisplayName()
+        << ": avcodec_decode_video2(): " << AVErrorToString(result) << ", at "
         << buffer->AsHumanReadableString();
     return false;
   }
 
   // FFmpeg says some codecs might have multiple frames per packet.  Previous
   // discussions with rbultje@ indicate this shouldn't be true for the codecs
   // we use.
   DCHECK_EQ(result, packet.size);
 
   // If no frame was produced then signal that more data is required to
@@ skipping 57 matching lines @@
   if (!codec || avcodec_open2(codec_context_.get(), codec, NULL) < 0) {
     ReleaseFFmpegResources();
     return false;
   }
 
   av_frame_.reset(av_frame_alloc());
   return true;
 }
 
 }  // namespace media